Homework Help: Algebra

Posted by Christina on Tuesday, December 7, 2010 at 8:36am.

Solve by elimination method.
7r-3s=14
3r+7s=64

Could never figure out the elimination method. Would love some help with this one. Thanks

Algebra - drwls, Tuesday, December 7, 2010 at 9:44am
21r - 9s = 42
(I multiplied the first eq. by 3)
21r + 49s = 448
(I multiplied the second equation by 7)

58s = 406
(I subtracted the third equation from the fourth, to eliminate r.)

The remaining steps are easy.

s = 7

7r -21 = 14
r = 5

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